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Old 30th January 2004, 06:15 AM   #11
diyAudio Member
 
Join Date: Jul 2003
Location: Newcastle, Australia
When the tone control is turned full bass, then it is lowering the total gain of the amplifier at high frequencies, thereby stopping oscillation. I would suspect problem is not actually in tone circuit, however, depending on circuit, faulty power supply bypass capacitor on power rails to tone circuit could cause it. Testing without speaker should not effect it as long as the network described in my last post is present and working - this puts a load on the amp at high frequencies, and as such is important.

A schematic of the amp would be extremely useful.......

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